• NiB-X Nickel Boron surface coating provides a lubricious surface and ensures smooth cycling as it minimizes fouling or grit adhesion
  • NiB-X Nickel Boron coating inside and out
  • "T" numbers engraved
  • Machined shell deflector, forward assist slot, and dust cover port (port door and forward assist not included)
  • M4 style feed ramps
  • Compatible with Mil-Spec AR-15 parts


  • Material: 7075-T6 Aluminum
  • Finish: NiB-X Nickel Boron
  • Weight: 8.82 oz.


  • AR-15 lower receiver


When you build an AR-15 one of the first components you’re going to look for is a great upper that suits the purpose of your build. You could have your eye on one of the complete uppers Wing Tactical offers, but if you want the ultimate control over your build, you’ll start with a stripped upper like the WMD NiB-X Nickel Boron Upper Receiver.

A Quality Billet Upper with the Features You Want

If you’re looking for a Billet Upper for your next AR build you should consider the WMD Guns NiB-X Nickel Boron Upper Receiver. This is a Quality Nickel Boron AR-15 Upper machined from aircraft grade aluminum with the features you need. This AR-15 A3/A4 Upper is crafted with a forward assist, Picatinny top rail and extended M4 style feed ramps to assure a reliable feed system when you complete it. After machining, the WMD Guns Upper gets special treatment in the form of their exclusive NiB-X nickel boron coating.

A Nickel Boron Upper Receiver with a Superior Treatment

The WMD NiB-X plating process is a lead-free nickel boron finishing process that stands out from the rest. Once complete, NiB-X surface coatings are the hardest nickel boron coatings in the industry. The friction coefficient is lower than other nickel boron coatings. NiB-X wears more than 30% longer than standard Mil-spec finishes, giving you a long-wearing upper for a great service life. When you choose a WMD Nickel Boron AR-15 you get an exceptional quality upper to build your rifle on. The self-lubricity of NiB-X coating will reduce your overall maintenance time because nickel boron surfaces resist accumulation of dirt and fouling this, in turn, reduces the risk of failures due to friction and binding caused by dirt and grime. The WMD NiB-X Nickel Boron AR-15 Upper Receiver is a great way to begin your build and give yourself an edge.

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